gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
   4    2009, 2010, 2011  Free Software Foundation, Inc.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    Under Section 7 of GPL version 3, you are granted additional
  19    permissions described in the GCC Runtime Library Exception, version
  20    3.1, as published by the Free Software Foundation.
  21
  22    You should have received a copy of the GNU General Public License and
  23    a copy of the GCC Runtime Library Exception along with this program;
  24    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25    <http://www.gnu.org/licenses/>.  */
  26
  27 #ifndef RS6000_BI_ARCH
  28
  29 #undef  DEFAULT_ABI
  30 #define DEFAULT_ABI ABI_AIX
  31
  32 #undef  TARGET_64BIT
  33 #define TARGET_64BIT 1
  34
  35 #define DEFAULT_ARCH64_P 1
  36 #define RS6000_BI_ARCH_P 0
  37
  38 #else
  39
  40 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
  41 #define RS6000_BI_ARCH_P 1
  42
  43 #endif
  44
  45 #ifdef IN_LIBGCC2
  46 #undef TARGET_64BIT
  47 #ifdef __powerpc64__
  48 #define TARGET_64BIT 1
  49 #else
  50 #define TARGET_64BIT 0
  51 #endif
  52 #endif
  53
  54 #undef  TARGET_AIX
  55 #define TARGET_AIX TARGET_64BIT
  56
  57 #ifdef HAVE_LD_NO_DOT_SYMS
  58 /* New ABI uses a local sym for the function entry point.  */
  59 extern int dot_symbols;
  60 #undef DOT_SYMBOLS
  61 #define DOT_SYMBOLS dot_symbols
  62 #endif
  63
  64 #define TARGET_PROFILE_KERNEL profile_kernel
  65
  66 #define TARGET_USES_LINUX64_OPT 1
  67 #ifdef HAVE_LD_LARGE_TOC
  68 #undef TARGET_CMODEL
  69 #define TARGET_CMODEL rs6000_current_cmodel
  70 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
  71 #else
  72 #define SET_CMODEL(opt) do {} while (0)
  73 #endif
  74
  75 #undef  PROCESSOR_DEFAULT
  76 #define PROCESSOR_DEFAULT PROCESSOR_POWER7
  77 #undef  PROCESSOR_DEFAULT64
  78 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER7
  79
  80 /* We don't need to generate entries in .fixup, except when
  81    -mrelocatable or -mrelocatable-lib is given.  */
  82 #undef RELOCATABLE_NEEDS_FIXUP
  83 #define RELOCATABLE_NEEDS_FIXUP \
  84   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
  85
  86 #undef  RS6000_ABI_NAME
  87 #define RS6000_ABI_NAME "linux"
  88
  89 #define INVALID_64BIT "-m%s not supported in this configuration"
  90 #define INVALID_32BIT INVALID_64BIT
  91
  92 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  93 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  94   do                                                            \
  95     {                                                           \
  96       if (!global_options_set.x_rs6000_alignment_flags)         \
  97         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  98       if (TARGET_64BIT)                                         \
  99         {                                                       \
 100           if (DEFAULT_ABI != ABI_AIX)                           \
 101             {                                                   \
 102               rs6000_current_abi = ABI_AIX;                     \
 103               error (INVALID_64BIT, "call");                    \
 104             }                                                   \
 105           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
 106           if (target_flags & MASK_RELOCATABLE)                  \
 107             {                                                   \
 108               target_flags &= ~MASK_RELOCATABLE;                \
 109               error (INVALID_64BIT, "relocatable");             \
 110             }                                                   \
 111           if (target_flags & MASK_EABI)                         \
 112             {                                                   \
 113               target_flags &= ~MASK_EABI;                       \
 114               error (INVALID_64BIT, "eabi");                    \
 115             }                                                   \
 116           if (TARGET_PROTOTYPE)                                 \
 117             {                                                   \
 118               target_prototype = 0;                             \
 119               error (INVALID_64BIT, "prototype");               \
 120             }                                                   \
 121           if ((target_flags & MASK_POWERPC64) == 0)             \
 122             {                                                   \
 123               target_flags |= MASK_POWERPC64;                   \
 124               error ("-m64 requires a PowerPC64 cpu");          \
 125             }                                                   \
 126           if ((target_flags_explicit & MASK_MINIMAL_TOC) != 0)  \
 127             {                                                   \
 128               if (global_options_set.x_rs6000_current_cmodel    \
 129                   && rs6000_current_cmodel != CMODEL_SMALL)     \
 130                 error ("-mcmodel incompatible with other toc options"); \
 131               SET_CMODEL (CMODEL_SMALL);                        \
 132             }                                                   \
 133           else                                                  \
 134             {                                                   \
 135               if (!global_options_set.x_rs6000_current_cmodel)  \
 136                 SET_CMODEL (CMODEL_MEDIUM);                     \
 137               if (rs6000_current_cmodel != CMODEL_SMALL)        \
 138                 {                                               \
 139                   TARGET_NO_FP_IN_TOC = 0;                      \
 140                   TARGET_NO_SUM_IN_TOC = 0;                     \
 141                 }                                               \
 142             }                                                   \
 143         }                                                       \
 144       else                                                      \
 145         {                                                       \
 146           if (!RS6000_BI_ARCH_P)                                \
 147             error (INVALID_32BIT, "32");                        \
 148           if (TARGET_PROFILE_KERNEL)                            \
 149             {                                                   \
 150               TARGET_PROFILE_KERNEL = 0;                        \
 151               error (INVALID_32BIT, "profile-kernel");          \
 152             }                                                   \
 153           if (global_options_set.x_rs6000_current_cmodel)       \
 154             {                                                   \
 155               SET_CMODEL (CMODEL_SMALL);                        \
 156               error (INVALID_32BIT, "cmodel");                  \
 157             }                                                   \
 158         }                                                       \
 159     }                                                           \
 160   while (0)
 161
 162 #undef  ASM_DEFAULT_SPEC
 163 #undef  ASM_SPEC
 164 #undef  LINK_OS_LINUX_SPEC
 165
 166 #ifndef RS6000_BI_ARCH
 167 #define ASM_DEFAULT_SPEC "-mppc64"
 168 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 169 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 170 #else
 171 #if DEFAULT_ARCH64_P
 172 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 173 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 174 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 175 #else
 176 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 177 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 178 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 179 #endif
 180 #endif
 181
 182 #define ASM_SPEC32 "-a32 \
 183 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 184 %{memb} %{!memb: %{msdata=eabi: -memb}} \
 185 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 186     %{mcall-freebsd: -mbig} \
 187     %{mcall-i960-old: -mlittle} \
 188     %{mcall-linux: -mbig} \
 189     %{mcall-netbsd: -mbig} \
 190 }}}}"
 191
 192 #define ASM_SPEC64 "-a64"
 193
 194 #define ASM_SPEC_COMMON "%(asm_cpu) \
 195 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
 196 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 197
 198 #undef  SUBSUBTARGET_EXTRA_SPECS
 199 #define SUBSUBTARGET_EXTRA_SPECS \
 200   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 201   { "asm_spec32",               ASM_SPEC32 },                           \
 202   { "asm_spec64",               ASM_SPEC64 },                           \
 203   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 204   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 205
 206 #undef  MULTILIB_DEFAULTS
 207 #if DEFAULT_ARCH64_P
 208 #define MULTILIB_DEFAULTS { "m64" }
 209 #else
 210 #define MULTILIB_DEFAULTS { "m32" }
 211 #endif
 212
 213 #ifndef RS6000_BI_ARCH
 214
 215 /* 64-bit PowerPC Linux is always big-endian.  */
 216 #undef  TARGET_LITTLE_ENDIAN
 217 #define TARGET_LITTLE_ENDIAN    0
 218
 219 /* 64-bit PowerPC Linux always has a TOC.  */
 220 #undef  TARGET_TOC
 221 #define TARGET_TOC              1
 222
 223 /* Some things from sysv4.h we don't do when 64 bit.  */
 224 #undef  TARGET_RELOCATABLE
 225 #define TARGET_RELOCATABLE      0
 226 #undef  TARGET_EABI
 227 #define TARGET_EABI             0
 228 #undef  TARGET_PROTOTYPE
 229 #define TARGET_PROTOTYPE        0
 230 #undef RELOCATABLE_NEEDS_FIXUP
 231 #define RELOCATABLE_NEEDS_FIXUP 0
 232
 233 #endif
 234
 235 /* We use glibc _mcount for profiling.  */
 236 #define NO_PROFILE_COUNTERS 1
 237 #define PROFILE_HOOK(LABEL) \
 238   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 239
 240 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 241 #undef  ADJUST_FIELD_ALIGN
 242 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 243   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 244    ? 128                                                                \
 245    : (TARGET_64BIT                                                      \
 246       && TARGET_ALIGN_NATURAL == 0                                      \
 247       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
 248    ? MIN ((COMPUTED), 32)                                               \
 249    : (COMPUTED))
 250
 251 /* PowerPC64 Linux increases natural record alignment to doubleword if
 252    the first field is an FP double, only if in power alignment mode.  */
 253 #undef  ROUND_TYPE_ALIGN
 254 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 255   ((TARGET_64BIT                                                        \
 256     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
 257         || TREE_CODE (STRUCT) == UNION_TYPE                             \
 258         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
 259     && TARGET_ALIGN_NATURAL == 0)                                       \
 260    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 261    : MAX ((COMPUTED), (SPECIFIED)))
 262
 263 /* Use the default for compiling target libs.  */
 264 #ifdef IN_TARGET_LIBS
 265 #undef TARGET_ALIGN_NATURAL
 266 #define TARGET_ALIGN_NATURAL 1
 267 #endif
 268
 269 /* Indicate that jump tables go in the text section.  */
 270 #undef  JUMP_TABLES_IN_TEXT_SECTION
 271 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 272
 273 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 274    than a doubleword should be padded upward or downward.  You could
 275    reasonably assume that they follow the normal rules for structure
 276    layout treating the parameter area as any other block of memory,
 277    then map the reg param area to registers.  i.e. pad upward.
 278    Setting both of the following defines results in this behavior.
 279    Setting just the first one will result in aggregates that fit in a
 280    doubleword being padded downward, and others being padded upward.
 281    Not a bad idea as this results in struct { int x; } being passed
 282    the same way as an int.  */
 283 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 284 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 285
 286 /* Specify padding for the last element of a block move between
 287    registers and memory.  FIRST is nonzero if this is the only
 288    element.  */
 289 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 290   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 291
 292 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 293    process.  */
 294 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 295
 296 #ifdef SINGLE_LIBC
 297 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 298 #else
 299 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 300 #endif
 301
 302 /* glibc has float and long double forms of math functions.  */
 303 #undef  TARGET_C99_FUNCTIONS
 304 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 305
 306 /* Whether we have sincos that follows the GNU extension.  */
 307 #undef  TARGET_HAS_SINCOS
 308 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
 309
 310 #undef  TARGET_OS_CPP_BUILTINS
 311 #define TARGET_OS_CPP_BUILTINS()                        \
 312   do                                                    \
 313     {                                                   \
 314       if (TARGET_64BIT)                                 \
 315         {                                               \
 316           builtin_define ("__PPC__");                   \
 317           builtin_define ("__PPC64__");                 \
 318           builtin_define ("__powerpc__");               \
 319           builtin_define ("__powerpc64__");             \
 320           builtin_assert ("cpu=powerpc64");             \
 321           builtin_assert ("machine=powerpc64");         \
 322         }                                               \
 323       else                                              \
 324         {                                               \
 325           builtin_define_std ("PPC");                   \
 326           builtin_define_std ("powerpc");               \
 327           builtin_assert ("cpu=powerpc");               \
 328           builtin_assert ("machine=powerpc");           \
 329           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 330         }                                               \
 331     }                                                   \
 332   while (0)
 333
 334 #undef  CPP_OS_DEFAULT_SPEC
 335 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 336
 337 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 338    defined on glibc-based systems. This temporary hack accomplishes this,
 339    it should go away as soon as libstdc++-v3 has a real fix.  */
 340 #undef  CPLUSPLUS_CPP_SPEC
 341 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 342
 343 #undef  LINK_SHLIB_SPEC
 344 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 345
 346 #undef  LIB_DEFAULT_SPEC
 347 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 348
 349 #undef  STARTFILE_DEFAULT_SPEC
 350 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 351
 352 #undef  ENDFILE_DEFAULT_SPEC
 353 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 354
 355 #undef  LINK_START_DEFAULT_SPEC
 356 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 357
 358 #undef  LINK_OS_DEFAULT_SPEC
 359 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 360
 361 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
 362 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
 363 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 364 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 365 #if DEFAULT_LIBC == LIBC_UCLIBC
 366 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
 367 #elif DEFAULT_LIBC == LIBC_GLIBC
 368 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
 369 #else
 370 #error "Unsupported DEFAULT_LIBC"
 371 #endif
 372 #define GNU_USER_DYNAMIC_LINKER32 \
 373   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
 374 #define GNU_USER_DYNAMIC_LINKER64 \
 375   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
 376
 377
 378 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 379   %{rdynamic:-export-dynamic} \
 380   -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}"
 381
 382 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 383   %{rdynamic:-export-dynamic} \
 384   -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}"
 385
 386 #undef  TOC_SECTION_ASM_OP
 387 #define TOC_SECTION_ASM_OP \
 388   (TARGET_64BIT                                         \
 389    ? "\t.section\t\".toc\",\"aw\""                      \
 390    : "\t.section\t\".got\",\"aw\"")
 391
 392 #undef  MINIMAL_TOC_SECTION_ASM_OP
 393 #define MINIMAL_TOC_SECTION_ASM_OP \
 394   (TARGET_64BIT                                         \
 395    ? "\t.section\t\".toc1\",\"aw\""                     \
 396    : ((TARGET_RELOCATABLE || flag_pic)                  \
 397       ? "\t.section\t\".got2\",\"aw\""                  \
 398       : "\t.section\t\".got1\",\"aw\""))
 399
 400 /* Must be at least as big as our pointer type.  */
 401 #undef  SIZE_TYPE
 402 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 403
 404 #undef  PTRDIFF_TYPE
 405 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 406
 407 #undef  WCHAR_TYPE
 408 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 409 #undef  WCHAR_TYPE_SIZE
 410 #define WCHAR_TYPE_SIZE 32
 411
 412 /* Override rs6000.h definition.  */
 413 #undef  ASM_APP_ON
 414 #define ASM_APP_ON "#APP\n"
 415
 416 /* Override rs6000.h definition.  */
 417 #undef  ASM_APP_OFF
 418 #define ASM_APP_OFF "#NO_APP\n"
 419
 420 #undef  RS6000_MCOUNT
 421 #define RS6000_MCOUNT "_mcount"
 422
 423 #ifdef __powerpc64__
 424 /* _init and _fini functions are built from bits spread across many
 425    object files, each potentially with a different TOC pointer.  For
 426    that reason, place a nop after the call so that the linker can
 427    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 428 #if DOT_SYMBOLS
 429 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 430   asm (SECTION_OP "\n"                                  \
 431 "       bl ." #FUNC "\n"                                \
 432 "       nop\n"                                          \
 433 "       .previous");
 434 #else
 435 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 436   asm (SECTION_OP "\n"                                  \
 437 "       bl " #FUNC "\n"                                 \
 438 "       nop\n"                                          \
 439 "       .previous");
 440 #endif
 441 #endif
 442
 443 /* FP save and restore routines.  */
 444 #undef  SAVE_FP_PREFIX
 445 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 446 #undef  SAVE_FP_SUFFIX
 447 #define SAVE_FP_SUFFIX ""
 448 #undef  RESTORE_FP_PREFIX
 449 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 450 #undef  RESTORE_FP_SUFFIX
 451 #define RESTORE_FP_SUFFIX ""
 452
 453 /* Dwarf2 debugging.  */
 454 #undef  PREFERRED_DEBUGGING_TYPE
 455 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 456
 457 /* This is how to declare the size of a function.  */
 458 #undef  ASM_DECLARE_FUNCTION_SIZE
 459 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 460   do                                                                    \
 461     {                                                                   \
 462       if (!flag_inhibit_size_directive)                                 \
 463         {                                                               \
 464           fputs ("\t.size\t", (FILE));                                  \
 465           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 466             putc ('.', (FILE));                                         \
 467           assemble_name ((FILE), (FNAME));                              \
 468           fputs (",.-", (FILE));                                        \
 469           rs6000_output_function_entry (FILE, FNAME);                   \
 470           putc ('\n', (FILE));                                          \
 471         }                                                               \
 472     }                                                                   \
 473   while (0)
 474
 475 /* Return nonzero if this entry is to be written into the constant
 476    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 477    or a CONST containing one of them.  If -mfp-in-toc (the default),
 478    we also do this for floating-point constants.  We actually can only
 479    do this if the FP formats of the target and host machines are the
 480    same, but we can't check that since not every file that uses
 481    the macros includes real.h.  We also do this when we can write the
 482    entry into the TOC and the entry is not larger than a TOC entry.  */
 483
 484 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 485 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 486   (TARGET_TOC                                                           \
 487    && (GET_CODE (X) == SYMBOL_REF                                       \
 488        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 489            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 490        || GET_CODE (X) == LABEL_REF                                     \
 491        || (GET_CODE (X) == CONST_INT                                    \
 492            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 493        || (GET_CODE (X) == CONST_DOUBLE                                 \
 494            && ((TARGET_64BIT                                            \
 495                 && (TARGET_MINIMAL_TOC                                  \
 496                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
 497                         && ! TARGET_NO_FP_IN_TOC)))                     \
 498                || (!TARGET_64BIT                                        \
 499                    && !TARGET_NO_FP_IN_TOC                              \
 500                    && !TARGET_RELOCATABLE                               \
 501                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
 502                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 503
 504 /* Select a format to encode pointers in exception handling data.  CODE
 505    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 506    true if the symbol may be affected by dynamic relocations.  */
 507 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 508 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 509   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 510    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 511       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 512    : DW_EH_PE_absptr)
 513
 514 /* For backward compatibility, we must continue to use the AIX
 515    structure return convention.  */
 516 #undef DRAFT_V4_STRUCT_RET
 517 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 518
 519 #define TARGET_POSIX_IO
 520
 521 #define LINK_GCC_C_SEQUENCE_SPEC \
 522   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 523
 524 /* Use --as-needed -lgcc_s for eh support.  */
 525 #ifdef HAVE_LD_AS_NEEDED
 526 #define USE_LD_AS_NEEDED 1
 527 #endif
 528
 529 #ifdef TARGET_LIBC_PROVIDES_SSP
 530 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
 531    ppc64 glibc provides it at -0x7010(13).  */
 532 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
 533 #endif
 534
 535 #define POWERPC_LINUX
 536
 537 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
 538 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 539 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 540 #endif
 541
 542 /* Static stack checking is supported by means of probes.  */
 543 #define STACK_CHECK_STATIC_BUILTIN 1
 544
 545 /* The default value isn't sufficient in 64-bit mode.  */
 546 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)